Abstract: A single screw, gate rotor machine in which compressible fluid is fed to the machine through a low pressure inlet and exhausts through a higher pressure outlet, in which an unloading valve is provided in the casing adjacent to the high pressure side of the gate rotor, or each gate rotor where there are two gate rotors.

Abstract: A switch device having a housing connectible to a side wall of a flow conduit, a cup element dangling at the end of a string in the conduit is adapted under a predetermined pressure of fluid flowing through the pipe to draw a magnet connected in the housing at the other end of the string against the bias of a spring away from a reed switch so as to move the contacts of the latter from one condition to another.

Abstract: A drill chuck of the angularly sliding jaw type having an integral nut and bevel gear element formed as an unbroken ring and then split in halves, the halves being held together by a chuck sleeve; and the teeth of the bevel gear being "blind", that is, to say the teeth are connected at their radially inner ends by an integral strengthening collar. The collar forms one of two bearing faces to maintain axial alignment of the integral nut and bevel gear element in the chuck body element.

Abstract: A relay unit associated with a fluid cooled transformer apparatus. The relay utilizes an hydraulic bellows circuit system to sense internal pressure changes developing in a tank member of the transformer apparatus; and it responds to a sudden rise in the pressure to operate an alarm switch. The system includes a group of three bellows, one of which reacts to pressure changes in the tank; and the other two of which respond according to the reaction of the first in controlling operation of the switch. A pivoted bracket and supporting spring arrangement associated with the bellows serves to control operation of the switch and to restrain it from being operated by shocks and the like attendant upon seismic conditions.

Abstract: An hydraulic rock drill having an hydraulically reciprocable hammer piston arranged to pound an anvil carrying a drill string. A sleeve type shiftable valve periodically engaged by the piston to effect alternate application to and relief of pressurized hydraulic fluid from the piston cylinder to reciprocate the piston. A constant supply of pressurized hydraulic fluid to actuate the piston is provided by a surrounding reservoir. Hydraulic feed means responds to a predetermined displacement of the anvil relative to the housing to feed the housing relative to the work in accordance with the progress of the anvil. Hydraulic means serves to cushion rebounding actions of the anvil; and means is provided to apply cooling fluid to the sliding surfaces of the tool during its operation.

Abstract: A pneumatically powered tool for setting of threaded fasteners, having an axially movable clutch assembly and a fastener drive spindle both of which are coupled for rotary motion to effect fastener run-up. Upon attainment of a predetermined torque load on the drive spindle, the clutch assembly and drive spindle are intermittently uncoupled by action of a ball being forced up a cam ramp, whereupon a latch pin is activated to initiate seating of an air inlet valve, thus terminating tool operation.

Abstract: A drill chuck of the angularly sliding jaw type including a jaw actuating nut and a sleeve associated with the nut mounted on the body of the chuck, various forms of abutment means being provided for retaining the sleeve in its required position relative to the nut.

Abstract: A locomotive speed recorder system having a gear train drive operable off the drive wheel of a locomotive, in which system a pneumatically operable cam bar is provided for disengaging the gear train drive so as to de-activate the recorder during dead-head engine runs. A changeable gear train is utilized to effect drive wheel wear compensation; and a right angle drive from the drive wheel incorporates reduction gearing to reduce wear of a flexible cable connecting the right angle drive with the recorder.

Abstract: A hand grip in the form of a sleeve unit having a body of elastomeric material provided with an internal cavity filled with a fluent material; and having an axial through hole adapted to slidably receive the shank of a chisel of a percussive tool, the hand grip adapted when manually squeezed to grip the shank of the chisel to allow insertion or removal of the shank from the tool, and adapted when grasped by the operator during operation of the tool to isolate the vibrations of the shank from the hand of the operator.

Abstract: A pneumatic tool having an exhaust air noise attenuating system in which air exhausting from a rotary air vane motor is caused to pass in order through an exhaust port, past a flexible leaf damper overlying the exhaust port into a wave modulating chamber containing an air diffusion screen, and finally through ports exiting to atmosphere. The damper is illustrated in a first form as applied to the motor of an impact wrench; and is illustrated in a second embodiment as applied to a grinding tool.

Abstract: A lift hook unit is described having a hook element swiveled to a supporting yoke; the hook element has a safety latch which is automatically movable from a normal open position to a closed position upon loading of the hook and is automatically returnable to open condition upon relaxing the load. A manual handle enables manual movement and guidance of the hook element in various directions as needed.

Abstract: A thermometer unit for monitoring the temperature of a fluid cooled electric transformer, the thermometer unit having a ceramic body insertable between the coils of the transformer winding immersed in cooling fluid in the transformer case. A nylon rod responsive to heat changes is confined in the interior of the body and is adapted to expand and contract according to the heat changes to vary volume flow of a gas circulated by a pump in a closed circuit connected with the body. Variations in the gas pressure are indicated on a sight gage externally of the transformer.

Abstract: An hydraulic feed control system for feeding or retracting a rotary rock drill relative to the work in a selected one of four modes; namely, standard feed; regeneration feed; standard retract; and rapid retract. The system includes an hydraulic circuit controlling the feeding and retraction of feed cylinders connected to the drill; a pair of hydraulic pressure supply sources; and a pair of manipulative control valves. A primary one of the valves controls flow from one of the sources directly into the circuit; and the other control valve is selectively operable to direct flow from the other source through the primary valve into the circuit so as to combine the flow from both sources for the regeneration feed and rapid retract modes.

Abstract: A sanding shoe for a portable sanding tool, the sanding shoe having a flexible pad for backing a sheet of sandpaper, a flexible supporting plate moulded into the pad, and lever actuable clamping jaws removably inserted in interlocking relation with the support plate for clamping the ends of a sheet of sandpaper in place.

Abstract: A non-impacting nut running pneumatic tool in which torque pulses are transmitted by an oscillating air motor through a one-way clutch and reduction gearing to the work. A torque responsive cam clutch member responds to a pre-determined delivered torque to cause stalling of the motor by blocking off escape of exhaust air and to cause discontinuance of further torque transmission to the work by disabling the drive connection. Manually operable adjusting means is provided to regulate the value of torque delivered.

Abstract: A nut running pneumatically powered tool, such as an impact wrench, having in a handle portion a group of valves including a throttle valve for admitting air to the tool, a manually adjustable directional valve for selectively directing the air to either a forward or reverse side of an air motor, and a regulating unit located between the directional valve and the throttle valve manually adjustable independently of the directional valve for regulating the volume air flow from the throttle valve to the directional valve.

Abstract: A rotary hand indicating instrument including a maximum hand and having a solid crystal formed with stub shafts projecting axially from its front and rear faces, upon which shafts the maximum hand and associated magnetic resetting control elements are mounted.

Abstract: A drill chuck having converging slidable jaws which are extendible and retractible relative to the body of the chuck by means of a key operable bevel gear part and an associated nut rotatable relative to the body, together with a driving component for the chuck for detachably mounting the chuck to the spindle of a power tool, and further provided with means for producing a self-centering action between the body part and the driving component. Various modifications of the components of the chuck, particularly the nut, bevel gear part, driving component and the self-centering means are also disclosed.

Abstract: A nut running air tool improved with a back and forth manually slidable control valve located between a throttle valve and an air motor, the control valve having a forward position allowing full volume air flow to the motor and maximum forward torque output, a reverse position allowing full volume air flow to the motor and maximum reverse torque output, and the control valve having integral manipulative means for adjusting its effective length so as to permit it to be moved to a third position allowing a restricted volume air flow to the motor and restricted forward torque output.

Abstract: A tube nut wrench having a slotted end for application of a socket member of the wrench laterally to a side of a tube so as to receive the latter into the socket and to allow the socket to be moved axially to receive the tube nut for setting the latter. A reversible air motor is used to rotate the socket member in a reverse direction to register a slot in the socket member with a slot in the end of the wrench to admit the tube at the start of an operation, or to allow withdrawal of the wrench from the tube at the end of an operation, the motor being operable in a forward direction to set the nut. An adapter is provided for engagement with the regular socket member to provide a larger socket for reception of a larger than usual size nut.